my 5 month old daughter is very chesty has a blocked nose & is full of phlegm which makes it difficult when she coughs she chokes as she cannot bring up the phlegm. my son had piriton diagnosed when he was under a year & i still have it i want to give to my baby as it will dry up the mucus/phlegm & help with her cough but do not know the correct dosage as it goes on weight, she weighs 17lb6oz. i know that 2.5ml is too much can anyone help if they have been in this situation. she has been sick for over 5 weeks now & i have tried all the home remedies, babyvicks, humidifier, karvol plug in, lavender oil, been to docs & hospital. government guidelines do not advocate piriton as parents were using to get kids to sleep!! i just want to stop the mucus dripping down her throat & clogging up her chest so she can breathe & be a bit happier.